

Hatsune Miku is a completely different thing. Hatsune Miku is a character/voice for a synthetic instrument called Vocaloid which is developed and owned by Yamaha. It’s a pretty cool piece of software where you input lyrics and a midi pattern, then the characters “sing”. Basically people became fans of the marketing design for the Hatsune Miku character specifically and it blew up from there.
That’s Grok’s killcode.